chemistry unit review crossword

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Across
  1. 1. Motion & Chemical Reactions
  2. 3. a thing that is composed of two or more separate elements.
  3. 5. is the horizontal rows.
  4. 6. atomic particles that move around the nucleus of an atom and carry a negative charge.
  5. 8. made the periodic table
  6. 12. accompanied by or requiring the absorption of heat.
  7. 14. it is the vertical rows
  8. 15. each of the actual or potential of a electron
  9. 17. a substance that takes part in and undergoes change during a reaction.
  10. 18. the mass of an atom of a chemical element
  11. 22. a substance that is not a metal.
  12. 24. an electron protons and neutrons are all basic particles in this.
Down
  1. 2. an atom contains the same number of protons and electrons this is called what?
  2. 4. a reaction that blows up by the release of heat.
  3. 5. this happens after the product reaction takes place.
  4. 7. found in nucleus of an atom.
  5. 9. system is neither created nor destroyed by chemical reactions or physical transformation.
  6. 10. electrons in the outer shell, determines chemical properties.
  7. 11. an element that its properties that are between those of metals and solid nonmetals.
  8. 13. is a combination of two or more elements linked together.
  9. 16. is a substance that is made up of one type of atom
  10. 19. it is shiny and is a solid material that is hard
  11. 20. letter or letters that is standing for a chemical element
  12. 21. atomic particles found in nucleus of an atom
  13. 22. elements like helium, neon, argon, krypton, xenon are all this.
  14. 23. the charged central core of an atom